Feature: Mouse drag events for scrolling the process list

The htop process list output with things like command line column enabled is very wide. As of version 3.5 it can be scrolled horizontally only via holding down the keyboard arrow keys.

The less pager in the recent version 700 provides the hdrag and vdrag options for it's --emouse mouse features enabling flag.

These options let user scroll the output via holding and dragging it with the mouse cursor as demonstrated in these screen captures:

https://github.com/user-attachments/assets/7ffee8d3-ecb7-4eb2-8cb6-68f3c419d4fc

(EDIT: same as above but sticky header more like in htop:)

https://github.com/user-attachments/assets/8b25662a-2b18-42b6-b0d8-ee52a41d19d2

That makes more accessible to quickly review wide, tabular output - such as a process list.

This Issue is a feature request to provide the same functionality to the htop process list.

If user is holding down the cursor and moving the mouse, instead of selecting a process it would take it as a drag scroll input in the respective directions.

Somewhat related to #2084